This is probably the main issue. People have a "public face" and a "private face". Facebook is primarily a public face medium. Coworker relationships are (for t

This is probably the main issue. People have a "public face" and a "private face". Facebook is primarily a public face medium. Coworker relationships are (for the most part) public face interactions. The only people capable of seeing the private face (and thus potential red flags) are close family members and trusted friends.